Spring - JSP 表单 :input on jsp page error: jasperexception

Question

当我将代码放入 View cadastro.jsp 上的 form:form 标记内时:

<div class="form-group">
<label for="nome" class="col-sm-2 control-label"> name Project: </ label>
<div class="col-sm-10">
<input for="nome" class="form-control" />
<form:errors path="nome" />
</div>
</div>

它的作品

但是当我把

<div class="form-group">
<label for="nome" class="col-sm-2 control-label"> Nome do Projeto: </ label>
<div class="col-sm-10">
<form:input  cssClass="form-control" path="nome" />
<form:errors path="nome" />
</div>
</div>

不起作用，因为表单:输入标签

错误:

HTTP Status 500 - An exception occurred processing JSP page /WEB-INF/view/cadastro.jsp at line 34

Projetro Controller

@RequestMapping(value = "/novoProjeto", method = RequestMethod.POST)
public String adicionarProjeto(@Valid @ModelAttribute("projeto") Projeto projeto, BindingResult result) {
    if(result.hasErrors()) {
        return("cadastro");
    }
    projeto.setStatus("NOVO");
    this.pc.salvar(projeto);
    return "redirect:/listar";

}

Answer 1

我认为您需要添加 <form:form>在表单周围添加标记，如下所示:

 <form:form>  
 <div class="form-group">
 <label for="nome" class="col-sm-2 control-label"> Nome do Projeto: </ label>
 <div class="col-sm-10">
 <form:input  cssClass="form-control" path="nome" />
 <form:errors path="nome" />
 </div>
 </div>
 </form:form>  

在Spring官方文档中，它指出:

All the other tags in this library are nested tags of the form tag.